JPH0533555Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a planar drainage material for guiding and draining underground water to the ground surface.

[Conventional technology]

Surface drainage materials used for backfill drainage in tunnels, grounds, slopes, etc., form a passageway for groundwater inside the ground, collect moisture from the surrounding ground in this passageway, and direct it to the ground surface for drainage. It has a role.

Conventional planar drainage materials are made by covering a flat resin fiber aggregate of a predetermined thickness with a nonwoven fabric, which is made by randomly gathering resin fibers.

[Problem that the invention attempts to solve]

However, in conventional planar drainage materials, there is a difference in the density of the resin fibers in each part of the resin fiber aggregate, and the earth pressure resistance strength of the coarse parts is lower than that of the dense parts, and When buried in the ground, the compressive deformation width due to earth pressure becomes extremely large in areas where resin fibers are loosely aggregated, and the distance between the resin fibers narrows, making it impossible to secure a sufficiently wide underground water passage in those areas. It disappears. Therefore, there was a problem that the drainage capacity of the entire planar drainage material was reduced.

In addition, since conventional planar drainage materials did not have very high bending strength, after construction, the middle part of the internal channel easily deformed into a sagging shape due to loads such as earth pressure. There was a problem that the collected water was difficult to drain smoothly.

The present invention solves the above problems, and aims to provide a planar drainage material that ensures uniform earth pressure resistance strength in each part and has high bending strength.

[Means for solving problems]

In order to achieve the above object, the planar drainage material of the present invention has concave portions and convex portions uniformly scattered over the entire surface or almost the entire surface, and groove-shaped ribs extending over the entire length in the vertical or horizontal direction. The synthetic resin net is covered with a water-permeable outer covering material.

[Effect]

If the planar drainage with the above configuration is buried in the ground,
Moisture in the ground passes through the outer skin and enters the interior of the planar drainage material, and flows through the mesh of the synthetic resin net.

Moreover, the earth pressure applied to the planar drainage material is borne by the sloped portions of the concave and convex portions and the groove-shaped ribs formed in this synthetic resin net.

〔Example〕

Figure 1a shows a planar drainage material 1 according to an embodiment of the present invention.
FIG. 1b is an end view taken along line A-A in FIG. 1a, FIG. 1c is an enlarged end view of the main part of FIG. A synthetic resin net 6 is a sheathing material covering the synthetic resin net 2, and has convex portions 3 uniformly scattered over the entire surface and groove-shaped ribs 5 extending over the entire length in the vertical direction. The synthetic resin net 2 is made of thermoplastic resin such as high-density polyethylene resin, polypropylene resin, polyvinyl chloride resin, etc., and has shape retention and elasticity itself. The outer covering material 6 is made of a water-permeable material such as woven fabric, non-woven fabric, or net having a fine mesh.

FIG. 2 is a perspective view showing the shapes of the protrusions 3, recesses 4, and groove-shaped ribs 5, and FIG. 3 shows the state in which the protrusions 3 and recesses 4 are scattered. These figures, Figures 1a and 1b
As can be inferred from the figure, the end face shape formed by the convex part 3 and the concave part 4 of the synthetic resin net 2 is
It has a sine curve or a waveform similar to a sine curve extending in the vertical and horizontal directions. Note that the shape of this end face is not limited to that shown in the drawings, and may be such that, for example, the top of the convex portion 3 or the bottom of the concave portion 4 is flat. Further, the convex portions 3 and the concave portions 4 are arranged regularly and alternately in the vertical and horizontal directions, while the groove-shaped ribs 5 are formed at a plurality of locations on the synthetic resin net 2 at predetermined intervals.

The synthetic resin net 2 has a lattice-like mesh 8 formed by warp threads 2a and weft threads 2b, and the size of the mesh 8 is such that a plurality of meshes are formed on one convex portion 3, as illustrated in FIG. The mesh size is determined to be such that the mesh 8... is included.

According to the planar drainage material 1 described above, the inclined portions of the convex portions 3 and recessed portions 4 and the groove-shaped ribs 5 counteract the compressive load in the thickness direction, and the inclined portion is conical. Since they are arranged at approximately equal pitches in the vertical and horizontal directions of the planar drainage material 1, the pressure resistance strength of the planar drainage material 1 against the above-mentioned compressive load is extremely large as a whole, and is evened out in each part. Become something. Also, as shown in Figure 4,
It has been found that if the intersections 9 between the warp threads 2a and the weft threads 2b are arranged at a plurality of locations including the center of the convex portion 3, the above-mentioned strength can be further increased.
In addition, the bending strength of the planar drainage material 1 is reinforced by the plurality of grooved ribs 5 .

Planar drainage material 1 has a width of 30 to 50 cm and a length of 1 to 4 m.
If it is kept to a certain level, it will be easier to handle during storage, transportation, and burying in the soil. In order to ensure sufficient earth pressure resistance required for the planar drainage material 1, the intervals between the convex portions 3 and the concave portions 4 arranged vertically and horizontally are determined according to the thicknesses of the warp threads 2a and the weft threads 2b. It is desirable that the intersections 9 between the warp threads 2a and the weft threads 2b be arranged at a plurality of locations including the center of the convex portion 3 as described above. In the case of the planar drainage material 1 used for drainage of tunnels, grounds, and slopes, high-density polyethylene resin is used as the synthetic resin net 2, the thickness of the warp threads 2a and the weft threads 2b is approximately 0.8 to 3 mm in diameter, and the convex portions are 3 and the recess 4 at a distance of about 1.73 to 17.3 mm, sufficient earth pressure resistance strength and sufficient bending strength reinforcing effect by the grooved ribs 5 can be obtained. If the warp yarns 2a and the weft yarns 2b are too thick, the mesh 8 will be too small and it will be difficult to secure a sufficient water passage area, and if they are too thin, the necessary elasticity and earth pressure resistance strength will not be exhibited. Warp thread 2a and weft thread 2
By setting the thickness of b to about 0.8 to 3 mm in diameter, it is possible to easily secure a sufficient water flow cross-sectional area when the width and length of the planar drainage material 1 are within the above range, and also to have sufficient earth pressure resistance. This ensures sufficient bending strength.
The cross-sectional shapes of the warp threads 2a and the weft threads 2b may be circular, flat, or polygonal. The height of the convex portion 3 (or the depth of the concave portion 4) is related to the thickness of the planar drainage material 1. If the height of the convex portion 3 is too high, the planar drainage material 1 will become too thick and will lack ease of handling; if the height is too low, the planar drainage material 1 will become too thin, reducing the water flow cross-sectional area. This causes a shortage in drainage, making it impossible to ensure sufficient drainage performance. The height of the convex portion 3 that does not cause such inconvenience is about 10 to 100 mm.

In this embodiment, the convex portions 3 and concave portions 4 are arranged in a lattice pattern over the entire surface of the synthetic resin net 2, but these may be scattered over almost the entire surface of the synthetic resin net 2. Further, although the channel ribs 5 are extended in the vertical direction, they may also be extended in the horizontal direction.If the grooved ribs 5 are extended in the horizontal direction, the flow direction of the water will be in the horizontal direction when the planar drainage material 2 is buried. make it match. Further, the groove shape of the groove-shaped rib 5 may be other than the illustrated shape, for example, a U-shape or a V-shape.

FIG. 5 shows the planar drainage material 1 buried in the ground. As shown in this figure, the planar drainage material 1 is buried so that the extending direction of the groove-shaped ribs 5 coincides with the flow direction F of the water collected inside the planar drainage material 1. , and planar drainage material 1
The required water flow gradient T can be obtained by slightly tilting the
be given. By doing this, the middle part of the planar drainage material 1 will not be deformed into a drooping shape due to the reinforcing action of the grooved ribs 5, and even if such deformation occurs, the width of the deformation will be minimal. This prevents water from accumulating in the deformed portion and preventing it from flowing.

FIG. 6 shows a state in which the planar drainage material 1 is buried behind a protection wall 10 constructed on a slope, and FIG. 7 shows a state in which the planar drainage material 1 is used for backfilling drainage of a tunnel wall 20. show.

In the case of Figs. 5 to 7, moisture in the ground that has passed through the outer skin 6 and entered the planar drainage material 1 passes through the mesh 8 of the synthetic resin net 2 (see Fig. 4 and Fig. 1c). flows. However, the intrusion of mud etc. into the planar drainage material 1 is prevented by the filter-like action of the outer skin material 6. Therefore, a situation where the mesh 8 is blocked by mud is prevented, and together with the reinforcing action of the grooved ribs 5 described above, good drainage performance is maintained over a long period of time. Furthermore, even if earth pressure is applied to the planar drainage material 1, since the planar drainage material 1 has a large earth pressure resistance strength as described above, the planar drainage material 1 will be compressively deformed due to the earth pressure. Bending is kept to a minimum. Therefore, the situation where the mesh 8 is blocked due to compressive deformation or bending and the drainage performance is deteriorated can be minimized. Nevertheless, the planar drainage material 1 is made by covering a synthetic resin net 2 with an outer covering material 6, and has excellent flexibility in each part in the lateral direction, so it can withstand changes in the ground. It also follows the ground and blends well with the ground.

The above-mentioned planar drainage material 1 can be easily obtained by hot-pressing a flat synthetic resin net 2 of a predetermined shape into an uneven shape and covering it with an outer skin material 6, and the entire process can be easily automated. It is something.

[Effect of idea]

As explained above, the planar drainage material of the present invention is
When used while buried in the soil, moisture in the ground is effectively drained to the surface. In this case, not only is sufficient earth pressure resistance strength ensured in each part so that it does not undergo excessive compressive deformation even under earth pressure, but also the reinforcing action of the channel members ensures that it will not bend in the vertical or horizontal direction. Because the strength is extremely high, it is easier to accurately set the water flow gradient during construction, and after construction, the water passage formed by the synthetic resin net will not be crushed by earth pressure or the surface shape will be affected. To avoid a situation where the drainage material is deformed into a sagging state. Therefore, good drainage performance can be maintained for a long period of time.

[Brief explanation of the drawing]

Fig. 1a is a partially cutaway end view of a planar drainage material according to an embodiment of the present invention, Fig. 1b is an end view taken along line A-A in Fig. 1a, and Fig. 1c is an essential view of Fig. 1a. Fig. 2 is a perspective view showing the shape of the protrusions, recesses, and groove-shaped ribs; Fig. 3 is an explanatory view showing the scattered state of the protrusions and recesses; Fig. 4 is an enlarged view of the protrusions. FIG. 5 is a schematic cross-sectional view showing an example of use of the planar drainage material, and FIGS. 6 and 7 are schematic cross-sectional views showing other examples of use. 1... Planar drainage material, 2... Synthetic resin net, 3
...Convex portion, 4...Concave portion, 5...Slotted rib, 6...
Outer skin material.

Claims (1)

[Scope of utility model registration request] A synthetic resin net having concave portions and convex portions uniformly scattered over the entire surface or almost the entire surface and having groove-shaped ribs extending over the entire length in the vertical or horizontal direction,
A planar drainage material coated with a water-permeable skin material.